Exam Questions Kae Answers

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(a) Define the term real time data collection. (2)
Real-time data collection means the information that is delivered immediately after the collection.
There is no delay in the timeliness of the information provided.


(b) Identify one analogue output device and one digital out put device involved in data logging. (2)
Analogue: thermometer, voltage logger
Digital: sound wave meter, heat meter


(c) Explain advantages and disadvantages of the real time data collection. (6)
Advantage:
  • The information is always up-to date
  • Easier to see the changes in the results

Disadvantage:
  • It will not be really suitable for long term data logging
  • Impossible to see the final result - which means people need to wait until the result comes out


(d) Evaluate the analogue device as compared to digital devices. And discuss how they are suitable or not suitable for the scenario. (10)
Analogue
  • Analogue device can be not really accurate
  • Need human workers to record and analysis the data
  • Suitable for short term experiment
  • Anyone is accessible and able to purchase because it is cheaper
  • It is not suitable for scenario because there are a lot of things to measure
  • Taking too much time
  • Human errors

Digital
  • It atomically records and analysis the data
  • Machine sometimes can be expensive
  • Needs a lot of equipments (software, hardware and PC to record the data)
  • Less time consuming
  • Too much information (e.g, machine can record the temperature per second... and if it is the long term experiment...)